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<h1 class="title">dynamicview.qml 示例文件</h1>
<span class="subtitle">tutorials/dynamicview/dynamicview4/dynamicview.qml</span>
<!-- $$$tutorials/dynamicview/dynamicview4/dynamicview.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2017 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
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  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
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  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
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  import QtQuick 2.0
  import QtQml.Models 2.1

  <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
      <span class="name">id</span>: <span class="name">root</span>

      <span class="name">width</span>: <span class="number">300</span>; <span class="name">height</span>: <span class="number">400</span>

      <span class="type"><a href="../qtqml/qml-qtqml-component.html">Component</a></span> {
          <span class="name">id</span>: <span class="name">dragDelegate</span>

          <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> {
              <span class="name">id</span>: <span class="name">dragArea</span>

              property <span class="type"><a href="../qtqml/qml-bool.html">bool</a></span> <span class="name">held</span>: <span class="number">false</span>

              <span class="type">anchors</span> { <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>; <span class="name">right</span>: <span class="name">parent</span>.<span class="name">right</span> }
              <span class="name">height</span>: <span class="name">content</span>.<span class="name">height</span>

              <span class="name">enabled</span>: <span class="name">visualModel</span>.<span class="name">sortOrder</span> <span class="operator">==</span> <span class="name">visualModel</span>.<span class="name">lessThan</span>.<span class="name">length</span>

              <span class="name">drag</span>.target: <span class="name">held</span> ? <span class="name">content</span> : <span class="name">undefined</span>
              <span class="name">drag</span>.axis: <span class="name">Drag</span>.<span class="name">YAxis</span>

              <span class="name">onPressAndHold</span>: <span class="name">held</span> <span class="operator">=</span> <span class="number">true</span>
              <span class="name">onReleased</span>: <span class="name">held</span> <span class="operator">=</span> <span class="number">false</span>

              <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> {
                  <span class="name">id</span>: <span class="name">content</span>

                  <span class="type">anchors</span> {
                      <span class="name">horizontalCenter</span>: <span class="name">parent</span>.<span class="name">horizontalCenter</span>
                      <span class="name">verticalCenter</span>: <span class="name">parent</span>.<span class="name">verticalCenter</span>
                  }
                  <span class="name">width</span>: <span class="name">dragArea</span>.<span class="name">width</span>; <span class="name">height</span>: <span class="name">column</span>.<span class="name">implicitHeight</span> <span class="operator">+</span> <span class="number">4</span>

                  <span class="name">border</span>.width: <span class="number">1</span>
                  <span class="name">border</span>.color: <span class="string">&quot;lightsteelblue&quot;</span>

                  <span class="name">color</span>: <span class="name">dragArea</span>.<span class="name">held</span> ? <span class="string">&quot;lightsteelblue&quot;</span> : <span class="string">&quot;white&quot;</span>
                  Behavior on <span class="name">color</span> { <span class="type"><a href="qml-qtquick-coloranimation.html">ColorAnimation</a></span> { <span class="name">duration</span>: <span class="number">100</span> } }

                  <span class="name">radius</span>: <span class="number">2</span>

                  <span class="name">Drag</span>.active: <span class="name">dragArea</span>.<span class="name">held</span>
                  <span class="name">Drag</span>.source: <span class="name">dragArea</span>
                  <span class="name">Drag</span>.hotSpot.x: <span class="name">width</span> <span class="operator">/</span> <span class="number">2</span>
                  <span class="name">Drag</span>.hotSpot.y: <span class="name">height</span> <span class="operator">/</span> <span class="number">2</span>

                  <span class="name">states</span>: <span class="name">State</span> {
                      <span class="name">when</span>: <span class="name">dragArea</span>.<span class="name">held</span>

                      <span class="type"><a href="qml-qtquick-parentchange.html">ParentChange</a></span> { <span class="name">target</span>: <span class="name">content</span>; <span class="name">parent</span>: <span class="name">root</span> }
                      <span class="type"><a href="qml-qtquick-anchorchanges.html">AnchorChanges</a></span> {
                          <span class="name">target</span>: <span class="name">content</span>
                          <span class="type">anchors</span> { <span class="name">horizontalCenter</span>: <span class="name">undefined</span>; <span class="name">verticalCenter</span>: <span class="name">undefined</span> }
                      }
                  }

                  <span class="type"><a href="qml-qtquick-column.html">Column</a></span> {
                      <span class="name">id</span>: <span class="name">column</span>
                      <span class="type">anchors</span> { <span class="name">fill</span>: <span class="name">parent</span>; <span class="name">margins</span>: <span class="number">2</span> }

                      <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Name: '</span> <span class="operator">+</span> <span class="name">name</span> }
                      <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Type: '</span> <span class="operator">+</span> <span class="name">type</span> }
                      <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Age: '</span> <span class="operator">+</span> <span class="name">age</span> }
                      <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">text</span>: <span class="string">'Size: '</span> <span class="operator">+</span> <span class="name">size</span> }
                  }
              }

              <span class="type"><a href="qml-qtquick-droparea.html">DropArea</a></span> {
                  <span class="type">anchors</span> { <span class="name">fill</span>: <span class="name">parent</span>; <span class="name">margins</span>: <span class="number">10</span> }

                  <span class="name">onEntered</span>: {
                      <span class="name">visualModel</span>.<span class="name">items</span>.<span class="name">move</span>(
                              <span class="name">drag</span>.<span class="name">source</span>.<span class="name">DelegateModel</span>.<span class="name">itemsIndex</span>,
                              <span class="name">dragArea</span>.<span class="name">DelegateModel</span>.<span class="name">itemsIndex</span>)
                  }
              }
          }
      }
      <span class="type"><a href="../qtqml/qml-qtqml-models-delegatemodel.html">DelegateModel</a></span> {
          <span class="name">id</span>: <span class="name">visualModel</span>
          property <span class="type"><a href="../qtqml/qml-var.html">var</a></span> <span class="name">lessThan</span>: [
              <span class="keyword">function</span>(<span class="name">left</span>, right) { <span class="keyword">return</span> <span class="name">left</span>.<span class="name">name</span> <span class="operator">&lt;</span> <span class="name">right</span>.<span class="name">name</span> },
              <span class="keyword">function</span>(<span class="name">left</span>, right) { <span class="keyword">return</span> <span class="name">left</span>.<span class="name">type</span> <span class="operator">&lt;</span> <span class="name">right</span>.<span class="name">type</span> },
              <span class="keyword">function</span>(<span class="name">left</span>, right) { <span class="keyword">return</span> <span class="name">left</span>.<span class="name">age</span> <span class="operator">&lt;</span> <span class="name">right</span>.<span class="name">age</span> },
              <span class="keyword">function</span>(<span class="name">left</span>, right) {
                  <span class="keyword">if</span> (<span class="name">left</span>.<span class="name">size</span> <span class="operator">==</span> <span class="string">&quot;Small&quot;</span>)
                      <span class="keyword">return</span> <span class="number">true</span>
                  <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">right</span>.<span class="name">size</span> <span class="operator">==</span> <span class="string">&quot;Small&quot;</span>)
                      <span class="keyword">return</span> <span class="number">false</span>
                  <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">left</span>.<span class="name">size</span> <span class="operator">==</span> <span class="string">&quot;Medium&quot;</span>)
                      <span class="keyword">return</span> <span class="number">true</span>
                  <span class="keyword">else</span>
                      <span class="keyword">return</span> <span class="number">false</span>
              }
          ]

          property <span class="type"><a href="../qtqml/qml-int.html">int</a></span> <span class="name">sortOrder</span>: <span class="name">orderSelector</span>.<span class="name">selectedIndex</span>
          <span class="name">onSortOrderChanged</span>: <span class="name">items</span>.<span class="name">setGroups</span>(<span class="number">0</span>, <span class="name">items</span>.<span class="name">count</span>, <span class="string">&quot;unsorted&quot;</span>)

          <span class="keyword">function</span> <span class="name">insertPosition</span>(<span class="name">lessThan</span>, item) {
              var <span class="name">lower</span> = <span class="number">0</span>
              var <span class="name">upper</span> = <span class="name">items</span>.<span class="name">count</span>
              <span class="keyword">while</span> (<span class="name">lower</span> <span class="operator">&lt;</span> <span class="name">upper</span>) {
                  var <span class="name">middle</span> = <span class="name">Math</span>.<span class="name">floor</span>(<span class="name">lower</span> <span class="operator">+</span> (<span class="name">upper</span> <span class="operator">-</span> <span class="name">lower</span>) <span class="operator">/</span> <span class="number">2</span>)
                  var <span class="name">result</span> = <span class="name">lessThan</span>(<span class="name">item</span>.<span class="name">model</span>, <span class="name">items</span>.<span class="name">get</span>(<span class="name">middle</span>).<span class="name">model</span>);
                  <span class="keyword">if</span> (<span class="name">result</span>) {
                      <span class="name">upper</span> <span class="operator">=</span> <span class="name">middle</span>
                  } <span class="keyword">else</span> {
                      <span class="name">lower</span> <span class="operator">=</span> <span class="name">middle</span> <span class="operator">+</span> <span class="number">1</span>
                  }
              }
              <span class="keyword">return</span> <span class="name">lower</span>
          }

          <span class="keyword">function</span> <span class="name">sort</span>(<span class="name">lessThan</span>) {
              <span class="keyword">while</span> (<span class="name">unsortedItems</span>.<span class="name">count</span> <span class="operator">&gt;</span> <span class="number">0</span>) {
                  var <span class="name">item</span> = <span class="name">unsortedItems</span>.<span class="name">get</span>(<span class="number">0</span>)
                  var <span class="name">index</span> = <span class="name">insertPosition</span>(<span class="name">lessThan</span>, <span class="name">item</span>)

                  <span class="name">item</span>.<span class="name">groups</span> <span class="operator">=</span> <span class="string">&quot;items&quot;</span>
                  <span class="name">items</span>.<span class="name">move</span>(<span class="name">item</span>.<span class="name">itemsIndex</span>, <span class="name">index</span>)
              }
          }

          <span class="name">items</span>.includeByDefault: <span class="number">false</span>
          <span class="name">groups</span>: <span class="name">VisualDataGroup</span> {
              <span class="name">id</span>: <span class="name">unsortedItems</span>
              <span class="name">name</span>: <span class="string">&quot;unsorted&quot;</span>

              <span class="name">includeByDefault</span>: <span class="number">true</span>
              <span class="name">onChanged</span>: {
                  <span class="keyword">if</span> (<span class="name">visualModel</span>.<span class="name">sortOrder</span> <span class="operator">==</span> <span class="name">visualModel</span>.<span class="name">lessThan</span>.<span class="name">length</span>)
                      <span class="name">setGroups</span>(<span class="number">0</span>, <span class="name">count</span>, <span class="string">&quot;items&quot;</span>)
                  <span class="keyword">else</span>
                      <span class="name">visualModel</span>.<span class="name">sort</span>(<span class="name">visualModel</span>.<span class="name">lessThan</span>[<span class="name">visualModel</span>.<span class="name">sortOrder</span>])
              }
          }
          <span class="name">model</span>: <span class="name">PetsModel</span> {}
          <span class="name">delegate</span>: <span class="name">dragDelegate</span>
      }
      <span class="type"><a href="qml-qtquick-listview.html">ListView</a></span> {
          <span class="name">id</span>: <span class="name">view</span>

          <span class="type">anchors</span> {
              <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>; <span class="name">top</span>: <span class="name">parent</span>.<span class="name">top</span>; <span class="name">right</span>: <span class="name">parent</span>.<span class="name">right</span>; <span class="name">bottom</span>: <span class="name">orderSelector</span>.<span class="name">top</span>;
              <span class="name">margins</span>: <span class="number">2</span>
          }

          <span class="name">model</span>: <span class="name">visualModel</span>

          <span class="name">spacing</span>: <span class="number">4</span>
          <span class="name">cacheBuffer</span>: <span class="number">50</span>
      }

      <span class="type">ListSelector</span> {
          <span class="name">id</span>: <span class="name">orderSelector</span>

          <span class="type">anchors</span> { <span class="name">left</span>: <span class="name">parent</span>.<span class="name">left</span>; <span class="name">right</span>: <span class="name">parent</span>.<span class="name">right</span>; <span class="name">bottom</span>: <span class="name">parent</span>.<span class="name">bottom</span>; <span class="name">margins</span>: <span class="number">2</span> }

          <span class="name">label</span>: <span class="string">&quot;Sort By&quot;</span>
          <span class="name">list</span>: [ <span class="string">&quot;Name&quot;</span>, <span class="string">&quot;Type&quot;</span>, <span class="string">&quot;Age&quot;</span>, <span class="string">&quot;Size&quot;</span>, <span class="string">&quot;Custom&quot;</span> ]
      }
  }

</pre>
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